Refrigerating apparatus



Oct. 25, 1927., v I 1,646,607

- J. O. BOVING REFRIGERATING APPARATUS Filed Dec. 22 1926 INVENTOR Jlns Orf'on Bow n9 1 H'TTORNEYS mama o... 25,1927.

' mus on'rnn BOVING, or. WESTMINSTER, Lonnon, ENGLAND/- EFBIGERATING APPARATUS.

' Applicationflledheeenibtri2$192${Seria1 a... 155,274, and in Great Britain March 5, 1926.1"

This invention relatesto refrigerating apparatus of the reversing absorption type, that is to say of the type comprisln a boiler which contains an absorbent liquid 6 volatile refrigerant and a condenser and evaporator for condensing the vapour-of the refrigerant driven oil from the boiler and for evaporating such liquefied refrigerant, the evaporated refrigerant being subsequent- 10 ly drawn back into the boiler and reabsorbed.

by the absorbent liquid therein. This action is intermittent, the-boiler being at one time heated to drive'ofi the refrigerant vapour whilst the con'denser is' cooled to condense the vapour, and at another time the boiler is cooled to withdraw the evaporated refrigerant from the evaporator.

More particularly the invention relates to. reversing-absorption. refrigeration apparatus of the kind wherein interruption of the alternative heating of the boiler and the supply of the cooling medium thereto are appropriately automatically controlled by the conditions prevailingin the apparatus. v

The object of the invention is to provide simple and reliable mechanism which can be set by hand to initiate the heating'of the boiler and which, on substantially all the absorbed refrigerant having been driven over into the condenser and evaporator, automatically initiates the interruption of thle coo heating of the boiler and initiates the ing thereof.

For this purpose, according to the invention, a loaded trip tending to interrupt the heating of the boiler and tocause the supply thereto of cooling medium is supported by a material adapted and arranged to fuse on the increase of temperature which occurs in the boiler when the refrigerant has been driven off. Such trip conveniently is supported by a rod resting ona plug of the fusible material located in a pocket extending'into the boiler. Also to avoid the rod becoming set in and held by the fusible material when the latter re-congeals, it is arranged thatafter escape of the trip, the rod is by spring action, previously overpowered by the superior pressure of the trip,raised out of the fused material.

An apparatus according to the invention is illustrated, by way of example,'diagrammatically on the accompanying drawing, in which Fig. '1 is a sectional elevation, and

Fig. 2 shows details.

for the municat'es' past a non-return valve '0 with a pipe d. This plpe (1 leads to a condenser 6,

' on a disc 9 at the head of a rod a is a boiler which is charged-with water and ammonia. or other refrigerant ,and is adapted to be heated by a gas burner b. A T e upper'portion of the boiler a comfrom whence a pipe 7' leads to an evaporator 9, Into which flows refrigerant liquefied in the condenser e from the vaporized refrigerant driven ofi from the boiler a when heated by the burner b.

. The condenser e'is cooled by water admitted by a pipe 71. and flowing out by a pipe 2'.

The pipe 0) interconnecting the boiler a and the condenser e is extended downwards within the .boiler a to beneath the-level pf. the liquid therein where it is perforated and extends horizontally. Within the lower portion. of the boiler a is provided a pipe coil 1', to which cooling water is admitted by a pi e k and from which such water flows out y an outlet Z. After approximately all of the refrigerant has-been driven off from the boiler a and liquefied in the condensers to flow .into theevaporator it becomes necessary to intersurrounding medium.

On being drawn. into the boiler a tlie vapour of the refrigerant is precluded by the non-return valve 0 from passing directl Y into the upper portion of the boiler but must as bubble from the lower immersed perforated portion of the pipe (1, through the liquid in; the boiler, whereby it becomes absorbed therein. a Now the present invention provides automatically actin I means for causing the supply of gas to t e burner b to becomeintemrupted and for causing the supply of coolingwater to the coilj, as-soon as the refrigerant has been driven off from "the boiler. This is efiected by means of a trip arm m which tends to be angularly displaced by aspring a. The trip arm m is supported against the tension of the spring a, by resting on a collar 0 on a rod 11. This rod p bears g in alignment therewith, and the lower end of the err ioo

. spindle m turns the coc rod 9 is stepped on a plug r of fusible material l'ocatedm a tubular pocket 8 extending downwards into but havlng no connection tothe burner b, and to a cock at w ich alternatively places the outlet pipe 11 for the cooling water from the condenser e-in communication with a drain pipe 0 or with the pipe k which admit-s cooling water to the boiler coil 7'. When the trip arm m is set so as to be supported by the rods'p, g, which can be effected byturning the spindle m by hand by a suitable hand lever (not shown), the gas supply to the burner 12 is opened by the cock :5 and the gas can be ignited-by a pilot light or otherwise, and the cock u diverts the cooling water to the drain pipe 11. Thus, on melting of the fusible plug 9 which is adapted to occur as soon as the temperature in the boiler a increases as a result of all the refrigerant vapour having been driven off, the rods p, g are forced down by the trip arm m, the nose of which then escapes from the collar 0. The trip arm m then turns under the influence of its s ring a and by its Es t and u so that gas is cut off from the burner b and cooling water is admitted to the boiler coil 1'.

To raise the rod q before the fusible plug 1" re-congeals, a spring to in compression is interposed on the rod 9 between the disc g and the top of the tubular pocket 8, which raises the rod g as soon as it is relieved from the thrust of the trip arm m,

To facilitate resetting, the nose of the trip arm .m and'the under surface of the collar 0 are appropriately bevelled and the rod p is separate from the rod 9.

YVhilst in the above described arrangement the condenser e is a separate vessel from the evaporator 9, these may be one and the same vessel, in which case a cock would be provided to interrupt the supply of cooling water to such a condenser-evaporator, when the boiler a is being cooled.

Also instead of the gas burner, an electric heater may be employed, the gas cook t being replaced b a rotary or other suitable switch operate by the trip arm m.

I claim:

1. In a refrigerating apparatus ofthe reversing absorption type, a boiler-absorber, means for heating said boiler-absorber, means for cooling said boiler-absorber, means for controlling said heating and cooling means, aloaded trip operating said controlling means, a pocket extending into said boiler-absorber, a. fusible plug located in said pocket, and a rod resting on said fusible plug and supporting said loaded trip.

' 2. In a refrigerating apparatus of the reversing absorption type, a boiler-absorber,

means for heating said boiler-absorber, means for cooling said boiler-absorber, means for controlling said heating and cooling means, a loaded trip operating said con trolling means, a pocket extending into said boiler-absorber, a fusible plug located in said pocket, a rod resting on said fusible ping, a second rod bearing on said, firstanentioned rod, and a collar on said second rod supporting said loaded trip.

3. In a refrigerating apparatus of the reversing absorption type, a boilerabsorber,

means for heating said boiler-absorber,

means for cooling said boiler absorber, means for controlling said heating and cooling means, a loaded trip operating said controlling means, a pocket extending into said boiler-absorber, a fusible plug. located in said pocket, a rod resting on said fusible plug and supporting said loaded trip, an abutment on said rod, and a spring lnterposed on said rod between said pocket and said abutment.

4:. In a refrigerating apparatus of the re- I versing absorption type, a boiler-absorber, means for heating said boiler-absorber, means for cooling said boiler-absorber, means for controlling said heating and cooling means, a loaded trip. operating said 'controlling means, a pocket extending into said boiler-absorber, a fusible plug located in said pocket, a rod resting on said fusible plug, an abutment on sa d rod, a spring in terposed on said rod between said pocket and said abutment, a second rod bearing on said first-mentioned rod, and a collar on said second rod supporting said loaded trip.

In testimony whereof I have signed my name to this specification.

JENS O-R'TEN BOVING. 

